Electric generator.



R. IVl. WARREN. ELEcTRxC GENERATOR'.

APPLICATION FILED APLZI. 1917.

` Patented July 31), 1918.

2 SHEETS-SHEET l.

Ww www @Montag R. lVf. WARREN.

ELECTRIC GENERATOR.

ARPLlcATloN FILED APR,21,1917.

.l ,274, l l 5 Patented July 3.0, 1918.

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.ROBERT MACK WARREN; oE sUMTER, sou'rn CAROLINA, AssIeNoR To SPLITDORF ELECTRICAL COMPANY, OF NEWARK, NEW' JERSEY, A CORPORATION OF JERSEY.

'ELECTRIC GENERATOR.

Spcification of Letters Patent.A lPatented July 30, 1918'.

Application filed April 2l, 1917 Serial No. 163,584.

Sumter, in the county of Sumter and State of South Carolina, have invented certain new and useful Improvements in Electric Generators, of which the following is a specification, reference being had to the accompanying drawing.

The invention relates to new and useful improvements in electric generators and more particularly to an electric generator which is formed as a part of the ily wheel of an engine. f

An object of the-'invention is to provide an electric generator which maybe used at the same time for generating both ignition current and lighting' current, and wherein the vflux 4receiving members carrying the windings for the ignition current and the winding for the lighting current are so arranged as to complete independent flux paths-between thepoles of the magnet or magnets supplying the flux.

A further Aobject of the invention is to provide an electric generator of the vabove character wherein the flux receiving mem- Y bers are stationary and located within a ro.

tating magnet' formed as a part of the ilywheel of an engine.

, A still further object of the invention 4is to provide anelectric generator-of the above character' wherein the rotating magnet is formed of segments arranged end to endand spaced from each other and wherein each pole piece for the sections of the mag- 'net is provided with a projecting portion extending into and llin the space between the adjacent ends of t e sections of the ma et. f

hese and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings whichshw b way of illustration` one embodiment of t e invention,

Figure 1 is a sectional view through an electric generator embodying my improvements, said section being taken in the lane 60 intersecting the axis of rotation o the magnet.

Fig. 2 is a sectional view on the line a-a: of Flg. 1.

Fig. 3 is a view showing more or less diagrammatically the rotating magnet, the flux receiving members, and the independent paths of flux through said flux receiving members at the time of current generation.

The electric generator consists broadly of a rotatingA magnet which is circular in form and referably formed in sections. This rotating magnet is mounted between nonmagnetic plates which are secured to and rotated with the engine shagft so that the circular `magnet is rotated with the engine. This circular magnet is provided with a lurality of pole pieces, preferably four, with their centers arranged at substantially ninety degrees apart. Coperating with the rotating magnet are ,two or more ux receiving members formed of suitable laminations carrying pole shoes.

members is provided with a coil suitably v connected and arranged sc that the current generated therein may be used for lighting purposes. The other flux receiving member is provided with primary and secondary coils, the secondary coil being connected through, suitable devices so that the currentY generated therein may 4be used for ignition purposes while the circuit including the primary. coil is provided v.with an interrupter timed so as to .break the primary circuit at proper intervals for ignition. These. flux receiving members are so constructed and arranged as to complete independent flux paths between the polesy of the magnet so that the current generating coil may be generating and furnishing lighting current `even when the primary circuit of the ignition coils is interrupted or broken.

Referring more in detail to the drawings,

myimproved electric generator consists of a back plate 3 which is fixed to the engine frame 1 by suitable lscrews. Mounted on this back plate are laminations forming independent cores or lux receiving members' 4: and 5. The core 4 is provided with pole shoes 6 and 7 while` the core 5 is provided with pole shoes 8 and 9. Extending about the core or lamination 4 is a suitable winding 10 one end of which is connected to the core at 11- and thus grounded through the frame. The other end of this winding is connected with the .terminal 12 Ainsulated from the back plate and from this terminal vof said winding connection is taken to a suitable lighting circuit such, for example,

-as the headlight of a motorcycle. Mounted e l' tact toward the iixed contact. '30

contacts.

on thecore or lamination 5 is a suitable primary winding 13 -and a secondary windlng 14.. These windings constitute the usual high tension ignition winding. @ne end ofthe primary winding is connected to the core at 15 and through the supporting rameor thecore this end of the primary winding is grounded. The other end Lof the primary 1s connected to an interrupter whichis of the usual construction. As indicated in the drawings, the primary is connected to the interrupter through the line 17 which is connected to' an insulated contact point 18. A movable lever 19 is adapted to cooperate Awith ao cam 20' mounted upon and movable with the hub 2l` of 'the electric generaton 'llhe lever i9 is pivoted at 23 to the bach plate 3 and carries a` movable contact 13a which coperates with the xed contact i3. A condenser indicated at 22 in Fig.- l' ot the drawingsis connected with the insulated contact 18 of the interruptor mechanism and is grounded through the trame so that said condenser is connected across the A spring 23a is wrapped about the fulcrum post for the lever i9 and normally operates to press the movable con-v 'llhe cam 20 'operates to separate the contacts @ne terminal ofthe secondary winding is connected tothe frame and through the trame is.

grounded while the remaining end oil the secondary is connected with a terminal mounted u on but insulated from the back plate 3. onnection is made between this terminal 16 and the `spark plug of the engine. f

F rom the above it will be noted that the generating coils and ux receiving members are stationary. Associated with these hun receivf Y ing members is a rotating magnet which roe tates about the pole shoes forming a part oil the ux receiving. members. v referred to is secured to the shalt 2 of the` engine in any suitable manner, such as by a hey 24 and a nut 25. Attached to this rotating hub is a non-magnetic disk 26. llllole o pieces 27, 28, 29 and 30 are secured to this non-magnetic disk 26 by suitable clamping bolts 26a. Each pole piece has an 4outwardly projecting part and the clamping titi bolt 26a Iextends through this projecting part.' A non-magnetic bach plate 3l is also secured to these pole pieces, the securing -bolts passing through or into this bach plate.

This bach plate is in the form ot a ring the inner edge oi which terminates at the inner faceA of the pole pieces 27, 23, 29 and 30. Secured to the pole pieces and to the members 26 and 3l are magnets 32, 33, 3d and 35. These magnets are each in the iorm of a segmentoff a' circle and together form in effect a single circular magnet. The projecting portion ot each' pole piece -piece. fills the spacebetween vthe ends of the- -net so that they would lie close together.

the adjacent ends of two magnet sections will be north poles while the next two adpoles7 etcr generated in the coils on the respective cores rlhe hub 2l above.

in the'coil on thecore 4l. By this arrangeerating current for ignition purposes.-

that an open magnetic circuit existsa natalia extends betweenthe adjacent-v ends' ol the sections of vthe magnet-to which `it vis attached, and this projecting part of the pole adjacent magnet sections. llt will thus be seen that the projecting vpart .of the pole piece may be readily shaped to lill this space while Iit would be more or less diiiicultto shape the ends of the sections of the mags The sections of the rotating magnet are secured to the pole pieces by suitable screws 36., ,llt is well understood that in a circular magnet having an even number 'oil segments jacent ends. in succession will be south In Fig'. 3 of the drawing, ll have shown" diagrammatically the path of dun from the magnet section 35 through the core 5 and. the winding carried thereby. This isein-1 1 dicated bythe broken line F and the direction ot rlow of the hun is indicated bythe arrow heads in the line.. ll have also 'shown in this ligure bythe broken line ll" the dow ,of magnetic hun from the magnet 33 'and llave indicated the direction. of How by the arrow heads inthe line. ll have further shown by theline F the flow of magnetic hun from the magnets 32 and 3l, While the dow ol? dun through the cores from these two magnets is, 4of course, much less thap the dow of ux from the magnets which operate substantially independently on the respective cores, still whatever How there may be the Hux from the magnets, 32 and 34e will augmentthe ux from the magnets 33 and 35 respectively. 'lhe current will be so inuenced by the magnets 33 and 35 respectively that any breaking of the primary circuit on the core '5`will not influence appreciably the currentl generated ment, therefore', ll am able to use the generating coil l0 on the core 4l as a coil for generating lighting current while the enerating collon the core 5 may be used or gen-1.

115 When the magnetic poles are in the position shown in Fig. i, the path or dus may befrom the pole piece 27 .to the pole piece 28, from the pole piece 29 to the pole pieceA 28, from the pole piece 27 to the pole piece 3@ 1120 and from the pole piece 29 to the pole piece 30.. ln `other words, 'the pole pieces ot the ring magnet are all short circuited. At no time can this magnet stop in such aposition i rlFhe entire rotating magnet and the parts supporting the same may be inclosed in a casing indicatedat C which will be clamped Ato the back plate 3 by suitable means. This inclosing casingS however; forms no part olf the present invention. The back plate 3 is provided with a socket to receive a ball bearing in which the engine shaft rotates.

It iS obvious that minor changes in the 'y rotation of said circular magnet, each of which is provided with pole shoes the centers of which are spaced substantially the same distance apart as the centers of the adjacent pole pieces of the magnet,' said flux receiving members being symmetrically disposed relative to the axis of the shaft and simultaneously coperating with the magnet pole pieces, Y a winding for one of said iux receiving' members for generating a lighting current, primary and secondary windings for the other flux receiving member forgenerating ignition current and an interrupter coperating with the last named windings.

2. An 'electric generator comprising a rotating shaft, a circular magnet carried thereby and concentric tothe axis of said shaft, said magnet having equally spaced olepieces with their centersV arranged at 90o apart, two stationary parallel flux receiving cores arranged at opposite sides of the center of rotation of the circular magnet and each of which is provided' with pole shoes, the centers of which arespaced substantially 90 apart, said cores being symmetrically disposed relative to the axis of the shaft and simultaneously coperating with the pole pieces of the magnet, a winding for one of said cores for producing lighting current, primary and secondary windings for the other core for producing ignition current' and an interrupter for the primary winding.

3. An electric generator including, in combination,- a fixed flux receiving member, a generating coil carried thereby, a rotatable hub, a non-magnetic plate Secured to said hub, spaced pole pieces secured to said nonmagnetic plate, and segmental magnets extending between adjacent pole pieces and connected thereto whereby a circular magnet is formed, each pole piece having an outwardly projecting portion extending into and filling the space between the ends of the.

magnet sectionto which it is secured. 4. An electric generator including, in combination, a relatively stationary flux receiv- -ing member havinga generating winding thereon, a rotatab e hub,'a non-magnetic plate carried by the hub, pole pieces secured. to said non-magnetic plate, magnet sectionsend with their ends spaced' arranged end to and overlapping and secured to pieces,

rojecting portions extending between and ling the space between the ends of the sections of the magnets.

the pole said pole pieces having outwardly.`

In testimony whereof I hereunto aix my signature.

ROBERT MACK; WARREN. 

